No file selector with Flash uploader

I have just upgraded to v 2.6 and the Flash Uploader for images is not working. By not working I mean nothing happens at all when I click on the “Choose files to upload” button. No messages, no pop-ups, no window, no failure to upload beacuse I can’t select anything to upload.

I did some searching and all the trouble shooting references I could find referred to 2.5 (saying 2.6 would fix most problems) and talked about cases where you got errors during or after uploads. I can’t even get that far.

I don’t know if it worked in 2.5 as I skipped that version.

I have deleted the files from the server and re-uploaded them to make sure they’re clean as detailed in most of the comments I’ve found.

I’ve cleared browser caches

I’ve tried uploading the mod-security .htaccess fix.

I get the same behaviour on both Firefox 3 and Internet Explorer 7 so this suggests either a general client PC problem or a server configuration problem.

The client PC is running Windows Vists Home Premium. Both IE7 and FF3 can view the flash test page (https://www.adobe.com/shockwave/welcome/) sucessfully and the version reporting page (https://kb.adobe.com/selfservice/viewContent.do?externalId=tn_15507) reports “Your Player Version WIN 10.0.0.525”.

I checked the FF3 error console and there are a bunch of CSS warnings reported but no errors and nothing that seemed relevant.

I’d be grateful for and suggestions on what I can check to track down the problem.